快速入门

安装

你可以使用我们的 AI 辅助设置来安装插件。使用以下命令将 Capgo skills 添加到你的 AI 工具中：

npx skills add https://github.com/Cap-go/capgo-skills --skill capacitor-plugins

然后使用以下 prompt：

Use the `capacitor-plugins` skill from `Cap-go/capgo-skills` to install the `@capgo/capacitor-printer` plugin in my project.

如果你更想手动设置，请运行以下命令安装插件，并按照下方各平台的说明操作：

bun add @capgo/capacitor-printer
bunx cap sync

导入

import { Printer } from '@capgo/capacitor-printer';

快速入门

打印磁盘上已有的 PDF（大文件推荐此方式）。

import { Printer } from '@capgo/capacitor-printer';

await Printer.printFile({
  path: 'file:///data/user/0/.../invoice.pdf',
  name: 'Invoice #1042',
});

示例：HTML 小票

await Printer.printHtml({
  html: '<h1>Thank you</h1><p>Total: $42.00</p>',
  name: 'Receipt',
});

示例：避免过大的 base64 负载

printBase64 会在内存中解码整个文件。对于约 5 MB 以上的资源，请写入临时文件并调用 printFile 请改用这种方式。

常见坑点

• 内存：在低内存设备上，过大的 base64 字符串可能会导致应用崩溃。
• Web 端：打印时会调用浏览器对话框，其布局与原生打印控制器不同。
• 路径：在 Android 上，请传入可访问的 file:// URI、绝对文件系统路径或 content:// URI。应用相对路径不会被自动解析。

API 概览

printBase64

展示用于打印 base64 编码文件的打印 UI。

平台行为：

• iOS: 使用 UIPrintInteractionController 处理 base64 解码数据
• Android: 使用 PrintManager 处理 base64 解码数据
• Web 端: 从 base64 数据创建 blob 并打开打印对话框

性能警告： 解码 base64 时，大文件可能会因内存限制导致 App 崩溃。 对于大于 5MB 的文件，建议改用 printFile()。

import { Printer } from '@capgo/capacitor-printer';

// Print a base64 encoded PDF
await Printer.printBase64({
  name: 'Invoice #12345',
  data: 'base64-encoded-pdf-data',
  mimeType: 'application/pdf',
});

// Print a base64 encoded image
await Printer.printBase64({
  name: 'Product Photo',
  data: '/9j/4AAQSkZJRgABAQEAYABgAAD/2wBDA...',
  mimeType: 'image/jpeg',
});

printFile

展示打印 UI 以打印设备本地文件。

平台行为：

• iOS: 使用 UIPrintInteractionController 并配合文件 URL。支持 file:// 路径或相对于应用 documents 目录的路径。
• Android: 使用 PrintManager 并配合文件路径。同时支持 content:// URI 和 file:// 路径。
• Web 端: 读取文件并打开打印对话框

支持的文件类型：

• PDF 文档 (application/pdf)
• 图片：JPEG, PNG, GIF, HEIC, HEIF

import { Printer } from '@capgo/capacitor-printer';

// iOS: Print from app documents directory
await Printer.printFile({
  name: 'Contract',
  path: 'file:///var/mobile/Containers/Data/Application/.../Documents/contract.pdf',
});

// Android: Print from content URI
await Printer.printFile({
  name: 'Receipt',
  path: 'content://com.android.providers.downloads.documents/document/123',
  mimeType: 'application/pdf',
});

// Android: Print from file path
await Printer.printFile({
  name: 'Photo',
  path: 'file:///storage/emulated/0/Download/photo.jpg',
  mimeType: 'image/jpeg',
});

printHtml

展示打印 UI 以打印 HTML 文档。

平台行为：

• iOS: 在 WKWebView 中渲染 HTML，然后使用 UIPrintInteractionController 打印
• Android: 在 WebView 中渲染 HTML，然后使用 PrintManager 打印
• Web 端: 创建包含 HTML 内容的 iframe 并触发打印对话框

HTML 要求：

• 应为结构完整的 HTML 文档
• 可以包含内联 CSS 样式或 style 标签
• 外部资源（图片、样式表）应使用绝对 URL
• 可使用以下方式添加打印专用 CSS

import { Printer } from '@capgo/capacitor-printer';

// Simple HTML document
await Printer.printHtml({
name: 'Sales Report',
html: '<html><body><h1>Q4 Sales Report</h1><p>Revenue: $125,000</p></body></html>',
});

// HTML with print-specific CSS
await Printer.printHtml({
name: 'Styled Invoice',
html: `
<html>
<head>
<style>

printPdf

展示打印 UI 以打印 PDF 文档。

平台行为：

• iOS: 使用带有 PDF 文件 URL 的 UIPrintInteractionController
• Android: 使用带有 PdfDocument 的 PrintManager
• Web 端: 创建对象 URL 并打开打印对话框

文件路径要求：

• iOS：必须是 file:// 路径，或相对于应用 documents 目录的路径
• Android：支持 content:// URI（来自下载、媒体库）或 file:// 路径
• Web 端：必须是可访问的文件路径

import { Printer } from '@capgo/capacitor-printer';

// Print PDF from app storage
await Printer.printPdf({
  name: 'Annual Report 2024',
  path: 'file:///var/mobile/Containers/Data/Application/.../Documents/report.pdf',
});

// Print PDF from Android downloads
await Printer.printPdf({
  name: 'Downloaded Document',
  path: 'content://com.android.providers.downloads.documents/document/123',
});

printWebView

显示打印 UI，用于打印 web view 内容。

打印当前在应用 web view 中显示的内容。

平台行为：

• iOS：使用 UIPrintInteractionController 配合 WKWebView 的 view printable
• Android: 使用 PrintManager 配合 WebView.createPrintDocumentAdapter()
• Web 端: 触发当前页面的 window.print()

打印样式： 支持通过 CSS 打印媒体查询自定义。将应用 web view 当前的样式，包括任何

import { Printer } from '@capgo/capacitor-printer';

// Print current web view with default name
await Printer.printWebView();

// Print with custom job name
await Printer.printWebView({
name: 'Dashboard Screenshot',
});

// Use with print-specific CSS in your HTML
// Add this to your app's CSS:
//

类型参考

PrintBase64Options

打印 base64 编码数据的选项。

export interface PrintBase64Options extends PrintOptions {
  /**
   * Valid base64 encoded string representing the file content.
   *
   * The base64 string should NOT include the data URL prefix (e.g., "data:application/pdf;base64,").
   * Only provide the raw base64 encoded content.
   *
   * **Performance Considerations:**
   * - Base64 encoding increases data size by approximately 33%
   * - Large files (>5MB) may cause memory issues when decoding
   * - Consider using printFile() for large documents
   *
   * **Platform Notes:**
   * - **iOS**: Decoded to NSData and passed to UIPrintInteractionController
   * - **Android**: Decoded to byte array and written to temporary file
   * - **Web**: Converted to Blob for printing
   *
   * @since 7.0.0
   * @example 'base64-encoded-pdf-data'
   */
  data: string;

  /**
   * MIME type of the base64 encoded data.
   *
   * **Supported types:**
   * - `application/pdf` - PDF documents
   * - `image/jpeg` - JPEG images
   * - `image/.png` - PNG images
   * - `image/.gif` - GIF images (iOS/Android only)
   * - `image/heic` - HEIC images (iOS only)
   * - `image/heif` - HEIF images (iOS only)
   *
   * **Platform Support:**
   * - All platforms support PDF, JPEG, and PNG
   * - GIF support varies by platform
   * - HEIC/HEIF are iOS-specific formats
   *
   * @since 7.0.0
   * @example 'application/pdf'
   * @example 'image/jpeg'
   */
  mimeType: string;
}

PrintFileOptions

用于打印设备存储中文件的配置项。

export interface PrintFileOptions extends PrintOptions {
  /**
   * Path to the file to print.
   *
   * **iOS Path Formats:**
   * - `file://` URL: Full file URL path
   * - Relative path: Path relative to app's documents directory
   * - Must be within app's accessible directories (documents, temporary, cache)
   *
   * **Android Path Formats:**
   * - `content://` URI: Content provider URI (recommended for external files)
   * - `file://` path: Direct file system path
   * - Must have read permission for the file
   *
   * **Common Use Cases:**
   * - App documents: Files saved in app's document directory
   * - Downloads: Files from system downloads folder (use content:// on Android)
   * - Temporary files: Files in app's temporary/cache directory
   * - Shared storage: Files from external storage (Android, requires permissions)
   *
   * @since 7.0.0
   * @platform ios Supports file:// paths and relative paths
   * @platform android Supports content:// URIs and file:// paths
   * @example 'content://com.android.providers.downloads.documents/document/123'
   * @example 'file:///var/mobile/Containers/Data/Application/.../Documents/document.pdf'
   * @example 'file:///storage/emulated/0/Download/receipt.pdf'
   */
  path: string;

  /**
   * MIME type of the file.
   *
   * **Platform Behavior:**
   * - **Android**: REQUIRED for content:// URIs. Helps the system determine how to handle the file.
   *                Optional for file:// paths (auto-detected from extension).
   * - **iOS**: Ignored. File type is auto-detected from file extension.
   * - **Web**: Optional. Auto-detected if not provided.
   *
   * **Common MIME Types:**
   * - `application/pdf` - PDF documents
   * - `image/jpeg` - JPEG images
   * - `image/.png` - PNG images
   * - `image/.gif` - GIF images
   *
   * @since 7.0.0
   * @default Undefined (auto-detected from file extension)
   * @platform android Used for content:// URIs and file type detection
   * @platform ios Ignored (auto-detected)
   * @example 'application/pdf'
   * @example 'image/jpeg'
   */
  mimeType?: string;
}

PrintHtmlOptions

用于打印 HTML 内容的配置项。

export interface PrintHtmlOptions extends PrintOptions {
  /**
   * HTML content to print.
   *
   * **Content Requirements:**
   * - Should be a complete HTML document with `<html>`, `<head>`, and `<body>` tags
   * - Can include inline CSS styles or `<style>` tags
   * - External resources (images, fonts) should use absolute URLs
   * - JavaScript is not executed during print rendering
   *
   * **Print Optimization Tips:**
   * - Use `@media print` CSS rules for print-specific styling
   * - Control page breaks with `page-break-before`, `page-break-after`, `page-break-inside`
   * - Hide UI elements using `.no-print { display: none; }` class
   * - Adjust font sizes for readability (12pt is standard for print)
   * - Use print-friendly colors (avoid dark backgrounds)
   *
   * **Platform Rendering:**
   * - **iOS**: Rendered in WKWebView before printing
   * - **Android**: Rendered in WebView before printing
   * - **Web**: Rendered in hidden iframe before printing
   *
   * **Character Encoding:**
   * - UTF-8 is recommended and default
   * - Include charset in HTML: `<meta charset="UTF-8">`
   *
   * @since 7.0.0
   * @example '<html><body><h1>Hello World</h1><p>This is a test document.</p></body></html>'
   * @example
   * ```typescript
   * const htmlWithStyles = `
   *   <html>
   *     <head>
   *       <meta charset="UTF-8">
   *       <style>
   *         @media print {
   *           body { font-family: Arial, sans-serif; font-size: 12pt; }
   *           .no-print { display: none; }
   *           h1 { color: #333; page-break-before: always; }
   *         }
   *       </style>
   *     </head>
   *     <body>
   *       <h1>Invoice #12345</h1>
   *       <p>Amount: $299.99</p>
   *     </body>
   *   </html>
   * `;
   * ```
   */
  html: string;
}

PrintPdfOptions

用于打印 PDF 文档的配置项。

export interface PrintPdfOptions extends PrintOptions {
  /**
   * Path to the PDF document.
   *
   * **iOS Path Formats:**
   * - `file://` URL: Full file URL path to PDF document
   * - Relative path: Path relative to app's documents directory
   * - Must be within app's accessible directories (documents, temporary, cache)
   * - PDF must be valid and not password-protected
   *
   * **Android Path Formats:**
   * - `content://` URI: Content provider URI (recommended for external PDFs)
   * - `file://` path: Direct file system path to PDF
   * - Must have read permission for the file
   * - Supports both single-page and multi-page PDFs
   *
   * **Web Path Formats:**
   * - Relative or absolute path accessible from web context
   * - Must be a valid PDF file
   *
   * **Validation:**
   * - File must exist at the specified path
   * - File must be a valid PDF (checked by magic number/header)
   * - File must be readable by the app
   *
   * **Common Sources:**
   * - App documents: PDFs saved in app's document directory
   * - Downloads: PDFs from system downloads (use content:// on Android)
   * - Generated PDFs: Temporary PDFs created by the app
   * - Network downloads: PDFs downloaded and saved locally
   *
   * @since 7.0.0
   * @platform ios Supports file:// paths and relative paths
   * @platform android Supports content:// URIs and file:// paths
   * @platform web Supports accessible file paths
   * @example 'content://com.android.providers.downloads.documents/document/123'
   * @example 'file:///var/mobile/Containers/Data/Application/.../Documents/document.pdf'
   * @example 'file:///storage/emulated/0/Download/report.pdf'
   * @example 'Documents/invoice-2024.pdf'
   */
  path: string;
}

PrintOptions

所有打印操作的基础配置项。

export interface PrintOptions {
  /**
   * Name of the print job.
   *
   * **Usage:**
   * - Displayed in the system print queue
   * - Shown in print history/logs
   * - May appear in printer status displays
   * - Used as default filename for "Save as PDF" option
   *
   * **Platform Behavior:**
   * - **iOS**: Shown in print preview header and activity view
   * - **Android**: Displayed in print job notification and print queue
   * - **Web**: Used as document title in print dialog
   *
   * **Best Practices:**
   * - Use descriptive names (e.g., "Invoice #12345", "Q4 Report")
   * - Keep under 50 characters for better display
   * - Avoid special characters that may cause issues in filenames
   * - Include relevant identifiers (order numbers, dates, etc.)
   *
   * **Examples:**
   * - "Invoice #12345"
   * - "Sales Report - 2024 Q4"
   * - "Customer Receipt - John Doe"
   * - "Product Photo - SKU-ABC123"
   *
   * @since 7.0.0
   * @default 'Document'
   * @platform ios Shown in print preview and activity view
   * @platform android Shown in print queue and notifications
   * @platform web Used as document title in print dialog
   * @example 'Invoice #12345'
   * @example 'Annual Report 2024'
   * @example 'Receipt - Order #789'
   */
  name?: string;
}

单一事实来源

本页面由插件的 src/definitions.ts生成。当上游的公共 API 发生变化时，请重新运行 sync。

从入门指南继续

如果你正在使用 快速入门 要规划 dashboard 和 API 操作，请将其连接到 使用 @capgo/capacitor-printer 在“使用 @capgo/capacitor-printer”中实现原生能力， API 概览 关于 API Overview 中的实现细节， 简介 关于 Introduction 中的实现细节， API 密钥 有关 API Keys 的实现细节，以及 设备 有关 Devices 的实现细节。